211240661994 has 32 divisors (see below), whose sum is σ = 469440195840. Its totient is φ = 70411078656.

The previous prime is 211240661867. The next prime is 211240661999. The reversal of 211240661994 is 499166042112.

211240661994 is a `hidden beast` number, since 2 + 1 + 1 + 24 + 0 + 6 + 619 + 9 + 4 = 666.

It is a super-3 number, since 3×211240661994³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (211240661999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2121759 + ... + 2219085.

It is an arithmetic number, because the mean of its divisors is an integer number (14670006120).

Almost surely, 2^211240661994 is an apocalyptic number.

211240661994 is an abundant number, since it is smaller than the sum of its proper divisors (258199533846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211240661994 is a wasteful number, since it uses less digits than its factorization.

211240661994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137531 (or 137525 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 211240661994 in words is "two hundred eleven billion, two hundred forty million, six hundred sixty-one thousand, nine hundred ninety-four".